RE: [TCML] Capacitor encapsulent

["Lau, Gary" <Gary.Lau@xxxxxx>]

If you reference the plastic dielectric data I included in a reply to this thread a few days ago, note that the dissipation factor for PET (polyethylene terephthalate) is MANY times higher than PP or PE, and is unsuitable for a TC cap dielectric for that reason.  Plus, I can't speak for Greg but I don't think my cuss word vocabulary is sufficient to deal with the persistent curling of the cut up sheets!

Regards, Gary Lau
MA, USA

polymer         dielectric      dielectric      dissipation
                constant        strength        factor
                50Hz / 1Mhz     (Kv/cm)         50Hz / 1Mhz (x10^-3)
--------        -----------     -----------     -----------
LDPE            2.29 / 2.28     370             .15 / .08
HDPE            2.35 / 2.34     --              .24 / .20
PP              2.27 / 2.25     240             .40 / .50
PVC-plasticized 4-8  / 4-5      270             80  / 120
PS              2.5  / 2.5      200-300         .1-.4/.05-.4
ABS             2.4-5/2.4-3.8   ~400            3-8 / 2-15
PMMA            3.3-3.9/2.2-3.2 140             40-60/4-40
POM             3.7 / 3.7       400             5 / 5
PTFE            2.1  / 2.1      480             .2 / .2
PCTFE           2.3-2.8/2.3-2.5 550             1 / 20
PA-6            3.8 / 3.4       400             10 / 30
PA-66           8 / 4           600             140 / 80
PC              3.0 / 2.9       380             .7 / 10
PET             4.0 / 4.0       420             2 / 20
PI              3.5 / 3.4       560             2 / 5
PUR-linear      5.8 / 4.0       >300            120 / 70
PUR-thermoset   3.6 / 3.4       240             50 / 50
PUR-thermoplas  6.6 / 5.6       300             30 / 60
CAB             3.7 / 3.5       400             6 / 21
Silicone        3.6             200             5-13 / 7


> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Jim Mora
> Sent: Wednesday, May 27, 2009 11:20 PM
> To: 'Tesla Coil Mailing List'
> Subject: RE: [TCML] Capacitor encapsulent
> 
> Gregory,
> You might consider collecting a number of clear 2 liter soda bottles and cut
> the flat sides into dielectric plates. They would be around 12x7 or so.PETE
> has a very high standoff and is much thinner than glass so the charge will
> be much greater. A roll of 5" flashing would be perfect for the plates. Is
> the dielectric thickness an inverse square relationship, anyone know?
> Jim Mora

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